Veterinary incisor-cutter



(No Model.)

H. HAUSSMANN. VETERINARY INGISOR CUTTER.

No. 403.105. Patented May 14, 1889.

NlTED STATES PATENT OFFICE,

HERMANN HAUSSMANN, OF CHICAGO, ILLINOIS.

VETERINARY INCISOR-CUTTER.

SPECIFICATION forming part Of Letters Patent NO. 403,105, dated May 14, 1889.

Application filed December 12, 1887. Serial No. 257,567. (No model.)

To all whom it may concern.-

Be it known that I, HERMANN HAUSSMANN, a citizen of the United States, residing in Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Veterinary Incisor-Outters, of which the following is a specification.

This invention relates to improvements in veterinary dental incisor-cutters, in which heretofore the cutting-jaw and sustainingjaw are pivoted together but are otherwise rigid, whiclrsaid cutters are employed for truing the crowns of the broken down and splintered incisors of a horse by a cut from the front to the rear of the incisors and in a downwardly-oblique direction with reference to their length.

The objects of my invention are to provide a dental incisor-cutter with a sustaining-jaw of such a character that it will automatically adjust itself to incisors substantially varying in contour, and thereby have the greatest possible bearing-surface on such incisors, which sustaining-jaw shall also be of a character that however much variation there may be in the angle of the cutthe implement cannot possibly exert a leverage on and calculated to break down the tooth.

A further object is to so combine with the sustaining-j aw proper a supplemental jaw movable independent of the sustaining-j aw in such a manner that said supplemental jaw will adapt itself not only to irregularities in the conformation of the tooth, but that, however much variation in the angle. of said jawv and tooth there may be with reference to the direction of the movement of the cutting-jaw, said'supplemental jaw will have the effect of directing the force exerted by the cutting-j aw through the incisor and in a direct line through the point of bearing of said supplemental jaw on the sustaining-jaw, whereby the force of the cutting-edge of the cuttingj aw is opposed by the sustaining-jaw and not by the tooth in such a manner that the full force of the cutting-edge is utilized in cutting the incisor, and the cutters are prevented from acquiring a leverage on and tending to break down the tooth or diminish the accuracy of the cut. I attain these objects by devices illustrated in the accompanying drawings, in which- Figure 1 illustrates a side elevation of a veterinary dental incisor-cutter, showing the posit-ion of the jaws and the tooth when a cut is finished; Fig. 2, a similar View of the same parts at the beginning of the cutting operation; Fig. 3, a detail perspective of the supplemental jaw.

Similar letters of reference indicate the same parts in the several figures of the drawings.

The cutting-jaw A and sustaining-jaw B, their manner of pivoting and form of their handles are of the ordinary form and arrangement now commonly employed in cutters for similar purposes.

The sustaining-j aw, which is so term ed because sustaining the tooth against the force of the cutting-jaw,hasaflat face and a shoulder similar to these prior tools; but such a form of face and shoulder is of no special importance in incisor-cutters embodying my invention because of the employment of a supplemental jaw, 0, now to be described.

As shown in the drawings, the supplemental jaw is provided on its under side with a perforated lug, a, projected into a corresponding recess or slot at or near the free end of the sustaining-jaw and held therein by a pivot, b, on which the supplemental jaw is free to vibrate. This supplemental jaw has a flat face opposing the cutting-jaw, projects forwardly beyond the end of the sustaining-jaw and backwardly therefrom a distance corresponding with that of the shoulder of the sustaining-jaw, and has rising from this rear or inner end a flange, 0, designed to form abearing or impinging surface, when desirable, for the end of a tooth during the cutting operation. As shown, the under side of the supplemental jaw is fiat, so that it may have a solid bearing, when desired, against the sustaining-jaw, and it also extends at an oblique angle to the opposing face of the supplemental jaw; but while such a construction is pre ferred, it is no departure from my invention to omit these details, and to have the under side of the supplemental jaw of any other form, so long as the supplemental jaw is free to have the required rocking movement on the sustaining-j aw, so that it may adjust itself to varying contours of teeth and the angles of the cut.

So, also, the flange 0 maybe omitted without a substantial departure from my invention, as hereinafter claimed, for while said flange is desirable for supporting the cutter on the end of the tooth the instrument may be practically held and operated without the use of a flange.

An important feature of my invention, however, is the location of the pivot or bearing of the supplemental jaw 011 the sustaining-jaw relative to the line of movement of the cutting-jaw when in operation, for said pivot should be so located as to prevent the cutter from exerting a leverage tending to break down or break oil? the tooth and to maintain the supplemental jaw so as to have an extended bearing along the length of the tooth during the cutting operation. To these ends the pivot or bearing on which the supplemental jaw oscillates should be as nearly as practical on a line coincident with that followed by the edge of the cutter when operated on a tooth. An exactness in this re spect, however, is not possible, owing to the cutting-edge moving on a circle, but if substantially as near such a line indicated by the dotted lines 1 and 2 the desired result for all practical purposes may be attained.

Instead of pivoting the supplemental jaw, as shown, it may be secured in any other wellknown manner permitting it to oscillate or rock on the supplemental jaw for the purposes describedas, for example, a lug or pin may project entirely through an elongated slot in the sustaining-jaw and be upset on the under side thereof.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a veterinarydental incisor-cutter, the cutting-jaw having a straight cutting-edge, and the sustainingjaw pivoted together, in combination with a supplemental jaw supported by and movable on the sustaining-j aw, the edge of the cuttingjaw extending at a right angle to the length of the supplemental jaw, substantially as described.

2. In a veterinary dental i11cisor-cutter,tl1e cutting-jaw having a straight cutting-edge, and the sustaining-jaw pivoted together, in combination with a supplemental jaw pivoted to the sustaining-jaw, the edge of the cuttingjaw extending at a right angle to the length of the supplemental jaw, substantially as described.

In a veterinary dental incisor-cutter, the cutting-jaw, and the sustaining-jaw pivoted together, in combination with a supplemental jaw supported by and movable on the sustaining-jaw, and provided at its inner end with a flange or shoulder, substantially as described.

l. In a veterinary dental i1'ieisor-cuttcr, the combination of a cutting-jaw, a sustainingjaw, and a supplei'nental jaw pivoted to the sustaining-jmv, the bearing of said supplemental jaw being in a line coincident with that traversed by the cutting-edge of the cutting-j aw, substantially as described.

IIERMANN IIAUSSMANN.

\Vitnesses:

W. W. ELLIOTT, WILL R. ()MOHUNDRO. 

